DOI: 10.1175/JCLI-D-17-0291.1
Scopus记录号: 2-s2.0-85040620856
论文题名: Lack of westerly wind bursts in unmaterialized El Niño years
作者: Seiki A. ; Takayabu Y.N. ; Hasegaw T. ; Yoneyama K.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 2 起始页码: 593
结束页码: 612
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Energy budget/balance
; ENSO
; Kinetic energy
; Madden-Julian oscillation
; Wind bursts
Scopus关键词: Atmospheric thermodynamics
; Budget control
; Climatology
; Kinetic energy
; Kinetics
; Nickel
; Oceanography
; Surface waters
; Wind
; Wind effects
; Atmosphere-ocean interactions
; Atmospheric intraseasonal variability
; Eddy kinetic energy
; Energy budget/balance
; ENSO
; Madden-Julian oscillation
; Sea surface temperature anomalies
; Westerly wind bursts
; Wind stress
; air-sea interaction
; eddy
; El Nino
; El Nino-Southern Oscillation
; energy balance
; kinetic energy
; Madden-Julian oscillation
; sea surface temperature
; temperature anomaly
; westerly
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
; Pacific Ocean (West)
英文摘要: The lack of westerly wind bursts (WWBs) when atmospheric intraseasonal variability (ISV) events occur from boreal spring to autumn is investigated by comparing two types of El Niño years with unmaterialized El Niño (UEN) years. Although high ocean heat content buildup and several ISV events propagating eastward are observed in all three types of years, few WWBs accompany these in the UEN years. The eddy kinetic energy budget analysis based on ISV shows that mean westerly winds in the lower troposphere facilitate the development of eddy disturbances, including WWBs, through convergence and meridional shear of zonal winds. In the UEN years, these westerly winds are retracted westward and do not reach the equatorial central Pacific mainly as a result of interannual components. In addition, positive sea surface temperature anomalies in the western Pacific, which are conducive to active convection, spread widely in a meridional direction centered on 15°N. Both westward-retracted mean westerlies and off-equatorial warming enhance off-equatorial eddies, which result in a reduction in equatorial eddies such as WWBs. The characteristics of the UEN years are significantly different from those observed during the eastern Pacific El Niño (EP-EN) years, which are characterized by anomalous cooling (warming) and suppressed (enhanced) convective eddies in the off-equatorial (equatorial) western Pacific. The central Pacific El Niño years show mixed features during both EP-EN and UEN years. Different background states not only in the equatorial region but also in the off-equatorial region can be a reason for the lack of WWBs in the UEN years. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111703
Appears in Collections: 气候减缓与适应
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作者单位: Department of Coupled Ocean-Atmosphere-Land Processes Research, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan; Research and Development Center for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan
Recommended Citation:
Seiki A.,Takayabu Y.N.,Hasegaw T.,et al. Lack of westerly wind bursts in unmaterialized El Niño years[J]. Journal of Climate,2018-01-01,31(2)